Folding bike frame



FIG. 1 is a perspective view of a folding bike frame, showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof; and,

FIG. 9 is a perspective view thereof shown in an alternative configuration.

The broken lines are included for the purpose of illustrating the environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a folding bike frame, as shown and described. 